Spark-plug.



A. J. PAROHBM.

SPARK PLUG.

APPLICATION FILED JAN.25, 1910. RENEWED SEPT.

Patented Oct. 29,1912

(Mimi L1, Parchem,

CASI'E R, E'ENNSYLVANIA.

Specification of Letters 'eetont.

new. P"? ,4 i TF ALBERT J. PARCHEM, 0F LANCASTER, PENNfiYLVAEETIA, ASSIGNOR GE ENE-HA WILLIAJVI F. LEBZELI'ER AND ONE-HALF T0 JOEN 5. TIIOTiIPfiO'N, 38TH Q3? SPAEK-PLUG.

Patentedfict. 2 .2. 212

Application filed January 25, 1910, Serialv 110.6%,045. Renewed September 18, 1911. eriel n5. 6%,319.

T 0 all whom it may concern:

Be it known that l, ALBERT J. PARCHEM, a citizen of the United States, residing at Lancaster, in the county of Lancaster and State of Pennsylvania, have invented certain new and useful Improvements in Spark Plugs, of which the following is a specification, reference being had therein to the accompanying drawing.

My invention relates to a spark-plug or igniter for internal combustion engines, on has for its object to produce a spark-plug of this class, which will be simple, reliable and so constructed that it cannot become fouled by oil or carbon.

A still further object or" the invention is to provide a spnrloplug which is provided with a movable contact which willrender the plug self-cleaning.

Another object ,is to produce a plug in which the porcelain or other insulating mesectional view line X-X or" terisl' is inserted in the plug from the octtoin, .thus preventing all danger of the insulation being blown out, and also all the pressure tends to force the insulating metericl. into closer contact- With the plug to'prevent all escape of gas.

Another object of the invention is to form n spark-plug, in which one terminal is provided by the bushing nut or cap which is threaded upon the lower end of the plug and which may be adjusted in relation to the point of contact to prodnce spark ups of various lengths.

With these and other ob ects in view my invention consists in certain construction and combination of parts as will hereinafter be fully described and claimed and illustrated in sccompunving drawings, which form r. '1; rt this application, and in whi h like :dgnres or reference refer to correspond ing parts in all of the views; but it is fully understood that while I have here described my invention as here shown, that I do not confine myself to the exact design its shown,

as slight chungesniuy be made in the con-.

struction and arrangement of the several parts without departing from the spirit of the invention.

in the drnwings:Figure l, is a vertical of a spark-plug, taken on the Fig. embodying my inven tion, and showing" one form of insulation 2, is a vertical sectional view, showing another form of insulation. 3 shows still another modified form of the invention. Fig. i, is a bottom plan View of a plug of the form shown in Fig. l. 5, at bottom plan view of the insulating member, showing the head of the terminal case. Fig. 6, is. a side elevation of the plug shown in Fig. 2. Fig. 7, is a bottom plan view of the bushing nut, or cs1). 8, is a partial enlarged detail sectional view of Fig.

' Referring; to the drawings, 1, indicates the metallic body the plug, which is provided with the usual external screw threads 2, for

attaching to the engine.

Referring to Figs. 2, 6, and 8., of the draw ings, which illustrate the preferred embodiment of 211:] device, the "plug body 1, .is formed with the axial cylindrical opening 3, which communicates at its lower end with the orifice or recess 4, ivhich'is or greater dia'meter than the opening 3, thus forming the shoulder 5. lVhile within said cylindrical opening 3, and the orifice 4:, is placed the insulating member 6, which is formed upon the lower end with the head i", for engaging the shoulder 5; the gasket 8, being placed between to form n gas-tight joint. The insulatingmernher 6-, is provided with a me tallic conductor 9, which is torniedot its lower end with the conical head 10-,nnd provided at its upper end, with the terminal 11. The orifice 4-, is formed. with the internal threads. 12, torthe reception of the bushingnu't or cap 13, which is formed with the ex ternal threaded flange M, and the shoulder 15, for engaging the lower edge of the insulating member 6; (with the gasket or washer 16, placed between) designed to 13, formed with a conical end 1?,

:the head-10, of the conductor 9, free from dirt and csrhon; while a spark may be no tained'while the plug is in any position, as the spark gap is either between the hell 1?), and head it), or between .the ball 19, and. the conical nut 3.3, sndis always the ssnie an pifm meted. to

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